}

    static void unlockUncleanly(File target) {
        def lock = createDefaultFileLock(target)
        try {
            lock.writeFile {
                throw new AnException()
            }
        } catch (AnException e) {
            lock.close()
        }
        lock = createDefaultFileLock(target)
        try {
            assert !lock.unlockedCleanly
        } finally {